Voltage Comparator circuit

Voltage Comparator circuit:-   A fixed reference voltage V_ref  is applied to the (-) input, and the other time – varying signal voltage V_in is applied to the (+) input; Because of this arrangement, the circuit is called the non-inverting comparator.  Depending upon the levels of V_in and V_ref,  the circuit produces output.  In short, the comparator is a type of analog-to-digital converter.

At any given time the output waveform shows whether V_in is greater or less than V_ref.  The comparator is sometimes also called a voltage-level detector because, for a  desired value of V_ref, the voltage level of the input V_in can be detected.

• A fixed reference voltage V_ref is applied to the (-) input, and to the other input a varying voltage V_in.
• Vary the input voltage above and below the V_ref  and note down the output at pin 6 of 741 IC.   
• Observe that, when V_in less than V_ref, the output voltage is -V_sat ( @ – V_EE)
•  when V_in is greater than V_ref­, the output voltage is +V_sat (@+V_CC).

Comparator Calculation:

• If V_in < V_ref, V_o = -V_sat @ – V_EE
• V_in > V_ref, V_o = +V_sat = +V_CC.

Readings;

Vin	V Ref=v	V = o/p
3	.75	+10
6	7.2	-10.5